Hot-air heater.



WJSWETLAND.

HOT AIR HEATER. APPLICATION FILED NOV- 13. m1.

Patenm Mar. 12, 1918.

I N 1' 'EN TOR. lmzz'm'w wannm swnrnmn, QFLOS'ANGELES, CALIFORNIA, assrenon 'I'O r; n. swn'rmnn,

or CLEVELAND, onro.

, nor-Am HEATER.

Specification of Letters Patent. Patented Diana 12, 191.8,.

Application filed November 13, 1917. Serial No. 202,058.

To all whom it may concern:

Be it known that I, WARREN SWETLAND, a citizen of the United States, residing in the city of Los Angeles, county of Los Angeles and State of California, have invented certain new and useful Improvements in HoteAir Heaters, of which the following is drawn down into the heater and returned a to the room after being heated, or fresh air from the outside can be directed into and through the heater and passed up into the room, as may be desired; and to provide in a device of the character referred to improved means for receiving the products of combustion, with means connected therewith for carrying oil the burnt gases and odor from the products of combustion. Other objects and advanta es of my improved heater will be pointe out in connection with the description of an embodiment thereof shown on the accompanying sheet of drawings, in which,- 1 i Figure 1 is a top plan view looking down into one of my improved heaters, parts being broken away for this purpose;

Fig. 2 is a horizontal sectional view thereof taken through the middle of the heater;

hig. 3 is a vertical sectionalview through the heater; and

Fig. 4 isa vertlcal sectional view through the heater at right angles to the view shown in Fig. 3.

Referring now more in detail to the drawings, l-designates an outer casing, preferably covered with asbestos or other insulating material to conserve the heat and give protection, and is suspended or supported up under the door, 2, beneath an opening therein, over which is placed a register, 3, which may be of any desired design.

Supported in the said outer casing 1, upon supporting bars 4, 4, therein is an intermedlate casing 5, open at both ends, its u per end, however, being tapered as at 5. aid intermediate casing 5 is spaced from the outer casing by means of brackets 6, 6. Mounted within said intermediate casing, and spaced therefrom around its sides, is an inner drum 7, of box-like form, and comprising top and bottom castings, 8 and 9, provided around their edges with grooves, as at 10, 10, in which is seated the upper and lower edges of .the inner drum side walls 11, as clearly shown in Fig. 3. This makes tight joints and prevents the gases and odors from escaping. Mounted in said inner drum 7,

are two tubes 12, 12, affording heating passageways through said inner drum, the castings 8 and 9 being provided with flanged and grooved openings 18, 13, to receive the ends thereof. A heat flue 14 communicates at its upper end, through the casting 9, with the inner drum 7, and at the lower end projects through the floor of the outer casing 1, as clearly indicated in Fig. 3. Mounted in the casting 8, of said inner drum 7 and directly above said flue 14, is a window 15. A burner 16, here shown to be a gas burner, is mounted directly beneath the flue 14, and is connected by means of suitable fittings 17 with any suitable source of gas supply. A valve 18, operated by a rod 19, extending upwardly through the floor, as at 20, provides means at the register for controlling the supply of gas to said burner 16. A pilot light 21 is also provided near said burner 16, for igniting the gas when turned on.

. Also mounted in the bottom casting 9, is a well member 22, communicatin with the interior of said inner drum 7, an extending through the floor of the outer casing 1, as shown. Leading from said well casing 22 isa pipe 23, extended-outwardlythrough the side of the casing 1, and communicating with a vertical flue 24, providedat its lower end with a damper ring 25, whereby a current of air canbe admitted to pass upthe well 22, through the pipe 23, the burnt gases, odors and the like, which are caused to settle into the Well 22.

Mounted in the side of the outer casing 1, is an air inlet flue 26, provided with a damper 27, operable by means of a rod 28, extended upwardly through the floor, near the register, as at 29, whereby fresh air from the outside can be supplied to said outer casing at will, to pass upwardly through the intermediate casing 5, around the inner drum 7, by which it is heated, and caused to pass upwardly through the register 3 and into the room. By closing the damper 27, and shutting ofl' the inlet for the cool fresh air from the outside, the air from the room will be drawn downwardly through the outer casing 1, outside the intermediate casing 5, as indicated by the outside arrows in Fig. 3, said air being drawn upwardly through the intermediate casing 5, around the,

inner heating drum 7, by which it is heated and caused to pass upwardly into the room through the middle portion of the register, as indicated by arrows in Fig. 3. A covered manhole, at 30, is also provided in the outer casing 1, for the purpose of affording access to the interior of the heater.

By providing a well 22, having the outlet flue 23, leading therefrom at a point above its bottom, and connected with the vertical flue 24, the heavier products of combustion, odors and the like, are caused to settle into said well 22, or to pass outwardly through the pipe 23, and the flue 24, without allowing the heat within said inner drum 7 to esca e therefrom,

Thus y this improved construction and arrangement, I am able to secure a maximum amount of heat in'the inner drum 7,

with "a minimum amount of fuel, for the reason that there is no escape of the heat which passes upwardly into said inner, drum 7, and only the heavier and cooler roducts of combustion which settle are a owed to' escape, and thus are drawn to the well 22,

by the entraining action of the air 'which.

passes upwardly through the vertical flue 24; I have also found that by shortening the intermediate casing 5, at its upper end, better results are secured than where the walls of said intermediate casing are extended to the re 'ster 3. I v

What I c aim and. desire to secure patent protection for is:

1. A hot air heater of the character shown and described comprising in combination an outer casing of'uni form diameter, open at its upper end and supported up underan opemng through a floor, a register covering the opening in the floor and'the open upper endof said casing, an intermediate casing supported in said outer casing and spaced therefrom around its sides and-open at both ends, its upperend terminating in a tapered portion at a distance below said register, an

inner drum mounted within said intermediate casing and spaced therefrom, said inner drum being provided with a downwardly exfloor o aid outer casing, a burner mounted under the lower end thereof, a well casing extending from the bottom of said inner drum to and through the bottom of said, outer casing, an outlet flue connected therewith intermediate its ends and extending tubes through said inner drum vertically, substantially as shown and described.

2. A hot air heater of the character shown and described comprising in-combination an outer casing-of uniform diameter, open at its upper end-and supported up under an opening through afloor, a register covering the opening in the floor and the open upper end of said casing, an intermediate casin supported in said outer casing and space therefromaround its sides and operr at both ends, its upper end tenninating'in a tapered tending heat flue projecting through the 4 portion at a distance below said register, an

inner drummounted within said intermediate casing and spaced therefrom, said inner drum being provided with a downwardly extending heat flue projecting through the floor of said outer casing, a burner'mounted under the lower end thereof, a well casing extending from the bottomof said inner drum to and through the bottom of said outer casing, an outlet flue connected therewith intermediate its ends and extending 1 laterally through the side of said outer casing.- an open ended vertical pipe with which said outlet; flue connects, whereby the passto, an outer casing, an intermediate casing therein and spaced therefrom and shorter than the outer cas g, an mner drum within .ing of air upwardly through said vertical i eee sie said intermediate casing means for heating said inner drum, a well opening through the floor of said inner drum and extended downwardly, an outlet pipe from theside of whereby air passing upwardly through said vertical pipe creates an entraining action 1n said Welland causes the heavier pructs of,

combustion to settle in said well, W M tially as described Signed at Los Angel es, Los Angeles 7 county, California, this 8th day of Novem- I ber, 1917.

I R SWE f In presence of- W. R. Lrrznmame, D. P. omen. 

